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/*-
* ============LICENSE_START=======================================================
* VID
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.openecomp.vid.encryption;
import java.lang.Character;
/**
* The Class EncryptConvertor.
*/
public class EncryptConvertor {
/** The Constant HEX_CHARS. */
private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray();
/**
* toHexString(String) - convert a string into its hex equivalent.
*
* @param buf the buf
* @return the string
*/
public final static String toHexString(String buf) {
if (buf == null) return "";
return toHexString(buf.getBytes());
}
/**
* toHexString(byte[]) - convert a byte-string into its hex equivalent.
*
* @param buf the buf
* @return the string
*/
public final static String toHexString(byte[] buf) {
if (buf == null) return "";
char[] chars = new char[2 * buf.length];
for (int i = 0; i < buf.length; ++i) {
chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4];
chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F];
}
return new String(chars);
}
// alternate implementation that's slightly slower
// protected static final byte[] Hexhars = {
// '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
// };
// public static String encode(byte[] b) {
// StringBuilder s = new StringBuilder(2 * b.length);
// for (int i = 0; i < b.length; i++) {
// int v = b[i] & 0xff;
// s.append((char)Hexhars[v >> 4]);
// s.append((char)Hexhars[v & 0xf]);
// }
// return s.toString();
// }
/**
* Convert a hex string to its equivalent value.
*
* @param hexString the hex string
* @return the string
* @throws Exception the exception
*/
public final static String stringFromHex(String hexString) throws Exception
{
if (hexString == null) return "";
return stringFromHex(hexString.toCharArray());
}
/**
* String from hex.
*
* @param hexCharArray the hex char array
* @return the string
* @throws Exception the exception
*/
public final static String stringFromHex(char[] hexCharArray)
throws Exception {
if (hexCharArray == null) return "";
return new String(bytesFromHex(hexCharArray));
}
/**
* Bytes from hex.
*
* @param hexString the hex string
* @return the byte[]
* @throws Exception the exception
*/
public final static byte[] bytesFromHex(String hexString) throws Exception
{
if (hexString == null) return new byte[0];
return bytesFromHex(hexString.toCharArray());
}
/**
* Bytes from hex.
*
* @param hexCharArray the hex char array
* @return the byte[]
* @throws Exception the exception
*/
public final static byte[] bytesFromHex(char[] hexCharArray)
throws Exception {
if (hexCharArray == null) return new byte[0];
int len = hexCharArray.length;
if ((len % 2) != 0) throw new Exception("Odd number of characters: '" + String.valueOf(hexCharArray) + "'");
byte [] txtInByte = new byte [len / 2];
int j = 0;
for (int i = 0; i < len; i += 2) {
txtInByte[j++] = (byte)(((fromHexDigit(hexCharArray[i], i) << 4) | fromHexDigit(hexCharArray[i+1], i)) & 0xFF);
}
return txtInByte;
}
/**
* From hex digit.
*
* @param ch the ch
* @param index the index
* @return the int
* @throws Exception the exception
*/
protected final static int fromHexDigit(char ch, int index) throws Exception
{
int digit = Character.digit(ch, 16);
if (digit == -1) throw new Exception("Illegal hex character '" + ch + "' at index " + index);
return digit;
}
// UNIT TESTS (same junit, but we want to run from command line
/**
* Check to hex string B.
*
* @param arg the arg
* @param expected the expected
* @return true, if successful
*/
public static boolean checkToHexStringB(String arg, String expected) {
String ret = toHexString(arg != null ? arg.getBytes() : null);
System.out.println("toHexString(" + arg + ")=> " + ret);
if (!ret.equals(expected)) System.out.println("\tWRONG, expected: " + expected);
return ret.equals(expected);
}
/**
* Check to hex string.
*
* @param arg the arg
* @param expected the expected
* @return true, if successful
*/
public static boolean checkToHexString(String arg, String expected) {
String ret = toHexString(arg);
System.out.println("toHexString(" + arg + ")=> " + ret);
if (!ret.equals(expected)) System.out.println("\tWRONG, expected: " + expected);
return ret.equals(expected);
}
/**
* Check from hex string.
*
* @param arg the arg
* @param expected the expected
* @return true, if successful
*/
public static boolean checkFromHexString(String arg, String expected) {
try {
String ret = stringFromHex(arg);
System.out.println("fromHexString(" + arg + ")=> " + ret);
if (!ret.equals(expected)) System.out.println("\tWRONG, expected: " + expected);
return ret.equals(expected);
} catch (Exception e) {
System.out.println("Caught exception: " + e.toString());
return false;
}
}
/**
* Check from hex string B.
*
* @param arg the arg
* @param expected the expected
* @return true, if successful
*/
public static boolean checkFromHexStringB(String arg, String expected) {
try {
byte[] ret = bytesFromHex(arg);
String sret = new String(ret);
System.out.println("fromHexString(" + arg + ")=> " + sret);
if (!sret.equals(expected)) System.out.println("\tWRONG, expected: " + expected);
return sret.equals(expected);
} catch (Exception e) {
System.out.println("Caught exception: " + e.toString());
return false;
}
}
/**
* The main method.
*
* @param args the arguments
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int pass = 0, fail = 0;
if (checkToHexString("", "")) pass++; else fail++;
if (checkToHexString(null, "")) pass++; else fail++;
if (checkToHexString("0", "30")) pass++; else fail++;
if (checkToHexString("abc", "616263")) pass++; else fail++;
if (checkToHexString("!@#$%^&*()", "21402324255e262a2829")) pass++; else fail++;
if (checkToHexStringB("", "")) pass++; else fail++;
if (checkToHexStringB(null, "")) pass++; else fail++;
if (checkToHexStringB("0", "30")) pass++; else fail++;
if (checkToHexStringB("abc", "616263")) pass++; else fail++;
if (checkToHexStringB("!@#$%^&*()", "21402324255e262a2829")) pass++; else fail++;
if (checkFromHexString("", "")) pass++; else fail++;
if (checkFromHexString(null, "")) pass++; else fail++;
if (checkFromHexString("30", "0")) pass++; else fail++;
if (checkFromHexString("616263", "abc")) pass++; else fail++;
if (checkFromHexString("21402324255e262a2829", "!@#$%^&*()")) pass++; else fail++;
if (checkFromHexStringB("", "")) pass++; else fail++;
if (checkFromHexStringB(null, "")) pass++; else fail++;
if (checkFromHexStringB("30", "0")) pass++; else fail++;
if (checkFromHexStringB("616263", "abc")) pass++; else fail++;
if (checkFromHexStringB("21402324255e262a2829", "!@#$%^&*()")) pass++; else fail++;
System.out.println("Tests passed: " + Integer.toString(pass));
System.out.println("Tests failed: " + Integer.toString(fail));
System.out.println("=======");
System.out.println("abc toHex = " + toHexString("abc"));
System.out.println("123 toHex = " + toHexString("123"));
try {
System.out.println("616263 FromHex = " + stringFromHex("616263"));
System.out.println("313233 FromHex = " + stringFromHex("313233"));
//System.out.println("current key FromHex = " + stringFromHex("57ajqe{kJjjarj}G#(3)ea7"));
} catch (Exception e) {
System.out.println("exception: " + e.toString());
}
}
}
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